plm on work, energy and power
TRANSCRIPT
PROGRAMME LEARNING MATERIAL ON WORK, ENERGY AND POWER
MADE BY-
SHAIKH FARZIN
ID- 14162073B.ED- SCI & EDU
CONTENT ANALYSIS
CONTENT ANALYSIS
CONTENT OBJECTIVE
•STUDENTS WILL BE ABLE TO
Illustrate work, energy and power with examples.
Define the concepts Solve problems.
State the difference between work and energy. Solve problems.
Understanding various forms of energy and their interconversion.
Deriving equations to calculate work, power, kinetic energy and
potential energy.
Interpreting similarities and differences between different forms of
energy.
Interpreting law of conservation of energy.
Solving work problems based on work , power and energy and
their calculations based on formulae derived.
DEAR STUDENT, READ THE PRESENTATION CAREFULLY ;
TO UNVEIL THE SECRET ANSWERS TO QUESTIONS LYING
WITHIN….
click here
01 02 03
04 05
Q.1: What is necessary for work to be done? Choose the correct statement:
(1) Action of force is necessary . (2) Displacement is necessary.
(3) Displacement in the direction of force is necessary.
a) Statement 1 and 2.
b) Statement 1.
c) Statement 2.
d) Statement 3.
Q.2 As angle between displacement and force increases magnitude of force
a) Remains constant.
b) Increases.
c) Reduces.
d) Remains constant or increases.
Q.3: A body of mass 10 kg performs motion along a circle of radius 5m
with a speed of 10 m/s. Work done during one revolution is ………
a) 2000 J
b) 1000 J
c) 500 J
d) Zero
Q.4: Which one among Kinetic energy, Potential energy and Mechanical energy
cannot be negative?
a. Kinetic Energy.
b. Potential Energy.
c. Mechanical Energy.
d. Potential and Mechanical Energy.
Q.5: Work done on a body is equal to change in ………………
1. Only kinetic energy.
2. Only potential energy.
3. Only mechanical energy.
4. Energy.
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QUESTION
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AGAIN
DEAR STUDENT, ANALYSE THE SUMS CAREFULLY IN THE
PRESENTATION ; TO UNVEIL THE SECRET ANSWERS TO
QUESTIONS LYING WITHIN….
01 02 03
04 05click here
Q.1: A man having its own mass 60 kg, climbs up 20 m height with a bucket
having water of mass 15 kg so, work done is ……….. KJ. (g=9.8 m/s^2 )
a) 15
b) 20
c) 150
d) 25
Q. 2: A box of 20 kg mass is pulled by a force F with constant velocity on a
horizontal surface. If the force of friction is 49 N. Work done during
displacement of 10 m is ……….. J.
a) 490
b) 245
c) 980
d) Zero
Q.3: Masses of two bodies are 1 kg and 4 kg respectively, if their kinetic
energies are in 2:1 proportion, ratio of their speeds is ……………
a) 2 : 1
b) 1:
c) 1:2
d) 2:1
Q.4: Engine of car of mass 1500 kg keeps on moving with constant velocity
5m/s. If the frictional force is 1000 N, power of engine is …….........
a) 5 kW
b) 7.5 kW
c) 15 kW
d) 75 kW
Q.5: Height of a water dam in a hydroelectric power station is 20 m.
How much water in one second , should fall on turbine so that 1MW
power is generated?
a) 5000 kg
b) 10000 kg
c) 500 kg
d) 7500 kg
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DEAR STUDENT, READ CONTENT GIVEN IN THE
PRESENTATION CAREFULLY ; TO UNVEIL THE SECRET
ANSWERS TO QUESTIONS LYING WITHIN….
01 02 03
04 05
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Q.1: Speed of a body in motion is doubled . Its kinetic energy is now
…………… times the original kinetic energy.
a) Two
b) Three
c) Four
d) One half
Q.2: An object is thrown vertically upwards with a velocity of 20 m/s. At
what height its kinetic energy and potential energy be equal? (g 9.8 m/s2)
a) 10 m
b) 20 m
c) 15 m
d) 5 m
Q.3: What is true for force F and component of force in the direction of
displacement F’?
a) F < F’
b) F > F’
c) F =< F’
d) F = F’
Q.4: 1 kWh =………….. J.
a) 36 * 10^6
b) 3.6 * 10^6
c) 3.6 * 10^7
d) 3.6 * 10^5
Q.5: When spring is compressed its potential energy is ……………..
a) Remains constant.
b) Reduces.
c) Increases.
d) Nothing can be said about it.
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